137 
 Gametophytein wide soft glossy yellowish-green intricate mats ; 
stems about 5 cm. long, subpinnately branching ;' stems and short 
branches complanate-foliate, lying in the same plane; older 
branches often radiculose at end ; branch leaves oblong-ovate, 1.5 
by 0.6—0.8 mm., acute, entire or slightly denticulate at apex, very 
concave ; costa short and double; median cells linear fusiform, 
IO-I5: I; quadrate alar cells. numerous ; stem leaves larger 
and broader at base: monoicous; male branches frequent; an- 
theridia few, large, cylindric; perigonial leaves sub-orbicular to 
oval, short acuminate, entire, ecostate: perichaetium 2.5 mm. 
long, loosely sheathing ; the inner leaves oblong-acuminate, den- 
ticulate at extreme apex; upper cells linear; basal enlarged, 
hyaline, rhomboidal to rectangular. Sporophyte 1.5 to 2.5.cm. 
high ; seta light reddish brown; capsule cylindric-ovoid, brown, 
3.5 mm. long, 5—6:1 ; annulus large, of two rows of cells ; peris- 
tome about .35-.4 mm. long; teeth linear-lanceolate, reddish 
brown, closely and regularly articulate and slightly. granulose- 
roughened below, lighter, more distantly articulate and smooth or 
finely. striolate above, with conspicuous median line, often perfo- 
rate between articulations ; segments linear, as long as the teeth ; 
spores minutely roughened, 164, maturing in autumn. 
Type locality, Lancaster, Pa. (Muhlenberg). 
On roots of trees, old logs, soil, etc. . Not uncommon in 
North America east of the Mississippi; Minnesota iius 
Iowa (A. S. Hitchcock and Miss McGee). 
ILLUSTRATIONS.—Sull, Icon. Musc. 7. 9z; Hedw. l. c; A. 
Gray, Man. Ed. 2, A. 5; Lesq. & James, Mosses of N. A. pl. 4 
Husnot, Musc: Gall. p/. 89; Rab. Krypt. Fl. 4: f. 356. o. 
ExsiccATi.—Drumm. Musc. Am. (S. States) 96, (Neckera 
cladorrhizans); Sull. Musc. Allegh. 77; Sull. & Lesq. Musc. 
Bor. Am. (Ed. 1) 260, (Ed. 2) "ies Macoun, Can. Musc. 263. 
Limpricht, in Rab. Krypt. Fl 4: part 3: 30, separates Æ. 
Schleicheri of Europe from £. ens sans and also cites Æ. 
cladorrhizans as European. That the two species are distinct can 
hardly be doubted, if the teeth of the peristome be compared. 
XE. acicularis C. Muell. and Kindb. in Macoun, Cat. Can. Pl. part 
6, 176 (Macoun's 816 in part and 170), is only a peculiar form 
of E. cladorrhizans. It may possibly prove to be a good variety. 
